18115245569 has 2 divisors, whose sum is σ = 18115245570. Its totient is φ = 18115245568.

The previous prime is 18115245541. The next prime is 18115245581. The reversal of 18115245569 is 96554251181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9075039169 + 9040206400 = 95263^2 + 95080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18115245569 is a prime.

It is a super-2 number, since 2×18115245569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18115245469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057622784 + 9057622785.

It is an arithmetic number, because the mean of its divisors is an integer number (9057622785).

Almost surely, 2^18115245569 is an apocalyptic number.

It is an amenable number.

18115245569 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115245569 is an equidigital number, since it uses as much as digits as its factorization.

18115245569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 47.

The spelling of 18115245569 in words is "eighteen billion, one hundred fifteen million, two hundred forty-five thousand, five hundred sixty-nine".